linux-kernel - Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

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Message-ID: <4CE2D41D.3070609@earthlink.net>
Date:	Tue, 16 Nov 2010 13:57:33 -0500
From:	Stephen Clark <sclark46@...thlink.net>
To:	Lennart Poettering <mzxreary@...inter.de>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Vivek Goyal <vgoyal@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

On 11/16/2010 01:16 PM, Lennart Poettering wrote:
> On Tue, 16.11.10 09:11, Linus Torvalds (torvalds@...ux-foundation.org) wrote:
>
>    
>> On Tue, Nov 16, 2010 at 9:03 AM, Lennart Poettering
>> <mzxreary@...inter.de>  wrote:
>>      
>>> Binding something like this to TTYs is just backwards.
>>>        
>> Numbers talk, bullshit walks.
>>
>> The numbers have been quoted. The clear interactive behavior has been seen.
>>      
> Here's my super-complex patch btw, to achieve exactly the same thing
> from userspace without involving any kernel or systemd patching and
> kernel-side logic. Simply edit your own ~/.bashrc and add this to the end:
>
>    if [ "$PS1" ] ; then
>            mkdir -m 0700 /sys/fs/cgroup/cpu/user/$$
>            echo $$>  /sys/fs/cgroup/cpu/user/$$/tasks
>    fi
>
> Then, as the superuser do this:
>
>    mount -t cgroup cgroup /sys/fs/cgroup/cpu -o cpu
>    mkdir -m 0777 /sys/fs/cgroup/cpu/user
>
> Done. Same effect. However: not crazy.
>
> I am not sure I myself will find the time to prep some 'numbers' for
> you. They'd be the same as with the kernel patch anyway. But I am sure
> somebody else will do it for you...
>
> Lennart
>
>    
So you have tested this and have a nice demo and numbers to back it up?

-- 

"They that give up essential liberty to obtain temporary safety,
deserve neither liberty nor safety."  (Ben Franklin)

"The course of history shows that as a government grows, liberty
decreases."  (Thomas Jefferson)



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